support tree node comment aligning

[aprilandjan]

For example:

# dist # the built files
# src # the source codes
## index.js # the entrypoint

turns into:

.
├── dist ......... the build results
└── src .......... the source codes
    └── index.js . the entrypoint

[mahyarmirrashed]

I think this is a great idea! Would you want to have \# be an escape sequence for having a literal # in the comment?

[aprilandjan]

@mahyarmirrashed yeah but it seems that using double forward slash // to representing the comment might be more suitable because the # is valid pathname in both mac and windows while / is not

[sz-p]

Could we add node comment by comment in file? see @file